Tanseimaruana sp. 1
Ampharetinae Malmgren, 1866
Tanseimaruana Imajima, Reuscher and Fiege, 2013
Tanseimaruana sp. 1
Voucher. INFLEX: station 2MFA
Diagnosis. Voucher is the only example collected in this study; small, slender specimen, incomplete, 4.1mm long and 0.35mm wide; thorax composed of paleae bearing segment and 17 chaetigers, of which 14 uncinigers; abdomen posteriorly incomplete with only 4 chaetigers present, 1st abdominal unciniger with dorsal foliose lobes. Pygidium unknown.
Prostomium simple, broadly triangular, with short paired nuchal slits, without incision, glandular ridges or eyespots. Paleae very slender (about as thin as following notochaetae, gradually tapering to hairlike tips ; very long, surpassing the prostomium. Four pairs of branchiae, arranged on raised ridge, branchial groups separated by small median gap; styles mostly missing, one apparently regenerating style very thin, smooth, cirriform.
Notopodia with capillary notochaetae, some longer and narrowly limbate capillary chaetae. Thoracic uncini similar to abdominal uncini with crest of numerous teeth above rostral tooth and basal prow. First abdominal unciniger with dermal fold across dorsum, bearing 4 smooth, foliose lobes with median lobes being larger than lateral ones. Rudimentary notopodia and glandular pads in abdominal uncinigers absent.
Remarks. Tanseimaruana sp. 1 represents a new species of this genus, which currently contains two species - type species T. vestis (Hartman, 1965) from deep waters off New England, Atlantic Ocean and T. boninensis, from deep waters off Chichijima Island in the Pacific Ocean. As its congeners, FI species shares prostomium without incisions or glandular ridges, with nuchal slits, segment II with paleae, 14 thoracic uncinigers and first abdominal unciniger with 4 dorsal foliose lobes. However it can be distinguished from the other species in arrangement of branchiae, which lie on a raised ridge in FI specimen, but are separated by a large median gap in the other species. However better preserved specimens as well as greater number of specimens are needed in order to fully characterise this species.
